A custom UploadHandler does not get the originial file name of uploaded files.

Please see pull request for details:
https://github.com/ezsystems/ezpublish-legacy/pull/1226/files

Reproduce the issue:

Create your own custom UploadHandler and implement the function 'handleFile'.

Dump the value for $originalFileName in your custom UploadHandler.

Now use a UI feature which is using the eZContentUpload - for example, upload an image on a relationlist attribute.

You'll see that the $originalFileName is the file path and not the File Title you specified in the UI.